Mechanical movement.



No, 659,993. Patented Oct. "5, I900;

E. T. STEWART.

MECHANICAL MOVEMENT.

(Application filed Apr. 24, 1900.) (No Model.)

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ELISHA T. STEWART, OF POETRY, TEXAS.

M ECHANICAL MOVEM ENT.

SPECIFICATION forming part of Letters Patent No. 659,993, dated October16, 1900.

Application filed April 24, 1900. serial No. 14,118. (No model.)

To all whom it 712mg concern.-

Be it known that I, ELISHA T. STEWART, a citizen of the United States,residing at Poetry, in the county of Kaufman and State of Texas, haveinvented new and useful Improvements in Mechanical Movements, of whichthe following is a specification.

This invention relates to an improved mechanical movement, and has forits object to provide improved means for transmitting motion from oneshaft to another in such manner that the maximum amount of power appliedto the driving-shaft will be transmitted to the driven shaft in the mosteifective manner, thereby utilizing the highest possible percentage ofthe power developed by the prime motor to perform the work to beaccomplished.

To this end my invention consists in the features and in theconstruction, combination, or arrangement of parts hereinafterdescribed, and particularly pointed out in the claims following thedescription, reference being had to the accompanying drawings, formingapart of this specification, wherein Figure 1 is a top plan view showingmy invention embodied in an operative structure by way of illustration;and Fig. 2 is a view in elevation, partly in section, of the same.

Referring to the drawings, the numeral 1 indicates adriving-shaft, and 2a driven shaft, the power from the prime motor being applied directly tothe driving-shaft 1 and the power of the driven shaft being utilized forperforming the work to be accomplished. The driving-shaft may beactuated in any suitable manner and by any preferred or approved means;but for the sake of illustration I have herein shown the same as beingdriven by an ordinary reciprocating engine 3, the piston 4 of which isattached to a cross-head 5, and to the cross-head is attached one end ofa pitman 6, the other end of said pitman being connected to acrank 7 onthe driving-shaft 1. Arranged to travel in suitable ways 8 isareciprocating carriage or slide-block 9, carrying a trunnion 10, saidcarriage being reciprocated back and forth in its ways by aconnecting-rod 11, one end of which is pivoted to said carriage and theother end journaled on a crank 12 on the driving-shaft 1. A crank 13 isfixed on the driving-shaft 1, and preferably has a greater throw thanthe pitman-crank 12, and on said crank 13 is journaled one end of alever, the otherend of which is journaled on a crank 14, fixed on thedriven shaft 2, said lever being fulcrumed intermediate its ends on thetrunnion 10, carried by the carriage 9. As shown, the lever is atelescopic lever-'-that is to say, it comprises two parts or sections 15and 16, the part 15 being attached at one end to the crank 14 andfulcrumed intermediate its ends on the shifting fulcrum 10, and on theother end of the section 15 is sleeved the tubular section 16, the outerend of which is journaled on the crank 13. The tubular section 16 isarranged to freely slide on the section 15, and the two form atelescopic lever adapted to be freely contracted and extended tocompensate for the dilference in throw of the cranks 13 and 14.

The power of the engine or other prime motor is transmitted by thecross-head and pitman 6 to the driving-shaft and rotates the latter. Thecrank 13 rotates with the driving-shaft and causes the end of thetelescopic lever 16 to travel in a circular path, and thus oscillatessaid lever about its fulcrum 10. The fulcrum 10, however, reciprocatesback and forth in unison with the cross-head 5, through the medium ofits described connection with the drive-shaft, and hence the combined.oscillating movement of the telescopic lever and the reciprocating orshifting movement of its fulcrum communicates rotary movement to thedriven shaft 2. As shown, the cranks 12 and 14 are set opposite to eachother. Hence the shafts 1 and 2 will be rotated in opposite directions,and it will also be noted that the driven shaft can never be on adead-center, for when the cranks 12 and 14 are in alinement the carriageand the fulcrum of the telescopic lever will be momentarily stationarybetween their reverse movements, and at such time the telescopic leverwill be exerting its most effective leverage to rotate the driven shaft.It also resuits from such an arrangement that the rotary movement of thedriven shaft is more uniform than where the shaft is driven directly bya crank and pitman, for as the cranks are approaching a position inwhich they will be in alinement or when they will exert the least powerand produce the slowest IOO movement of the shaft 2 the telescopic leverwill be exerting its greatest force on the crank of the driven shaft andwill be communicating the greatest movement thereto. For the severalreasons stated the movement of the driving-shaft will be communicated tothe driven shaft in the most effective manner and in a manner to utilizethe highest possible percentage of the power developed by the primemotor.

I have shown the device arranged to be usediu connection with anordinary type of reciprocating engine; but it will be readily understoodthat it may be used in connectionv with any type of engine, motor, ormeans for producing'and utilizing power, or in any case Where it isdesired to transmit power from its source of generation to the work tobe done. Furthermore, the cranks and telescopic lever may be made of anylength or size, and the fulcrum of the telescopic lever may be arrangedat any distance from the driven shaft.

It will be obvious to those skilled in the art that the engine-cylinder,cross-head, and pitman may be duplicated-that is to say, asimilarcylinder, cross-head, and pitman may be arranged on the opposite side ofthe frame and connected with the driving -shaft, thereby driving thelatter from'a double-cylinder engine.

Having described my invention, what I claim is- 1. The combination witha cranked driveshaft and a cranked driven shaft, and means for rotatingthe drive-shaft, of a telescopic lever journaled at its opposite ends onthe cranks of the drive and driven shafts,'and pivoted intermediate itsends on a shifting fulcrum, substantially as described.

2. The combination with acranked driveshaft and a cranked driven shaft,of a telescopic' lever journaled at its opposite ends on the cranks ofthe drive and driven shafts and pivoted intermediateits ends on ashifting 3 fulcrum, and means for" shifting thefulcrum ELISI-IA T.STEWART.

Witnesses:

T. L. FRANK, H. L. STEWART.

